This colloquialism originates in the infamous and widely publicized 1983 incident where Mitt Romney strapped his Irish setter, Seamus, to the roof of his car whilst driving to Canada, causing the terrified dog to defecate.

"The door of the cab literally GRAZED my knee as it whizzed by. I nearly Romneyed!"

"The best part of working a haunted house is seeing the big tough dudebro types trying not to romney in front of their girlfriends."